As we reported Wednesday, when Johnson pressed Clinton on what the administration knew about the attack and when it new it, the secretary showed some anger as she said:

"The fact is we had four dead Americans. Was it because of a protest or was it because of guys out for a walk one night who decided they'd go kill some Americans? What difference, at this point, does it make? It is our job to figure out what happened and do everything we can to prevent it from ever happening again. senator."

Clinton, as you're probably aware, is soon stepping down. President Obama has nominated Sen. John Kerry, D-Mass., to be her successor. Today at 10 a.m. ET the Senate Committee on Foreign Relations — same committee that held Wednesday's hearing — holds its confirmation hearing for Kerry.

Kerry, the committee's chairman, will not be presiding over his own nomination hearing. Sen. Robert Menendez, D-N.J., will be in the chairman's seat. It's expected that Kerry will face little opposition in the Senate.